code: def on_exp_start(self):
      self.data_train.input.on_exp_start()
      super().on_exp_start()
  
file_path: hyperparameter_hunter/hyperparameter_hunter/callbacks/wranglers/input_wranglers.py
imports: from hyperparameter_hunter.callbacks.bases import BaseInputWranglerCallback
  from hyperparameter_hunter.data import TrainDataset, OOFDataset, HoldoutDataset, TestDataset
label_desc: Use image node_id 1 for calling the WranglerInputTrain obj's underlying member method code with example usage: obj.on_exp_start() without return types